Syaoran Li defeats - and eats - Touya Kinomoto

shota boy Syaoran challenges Sakura's annoying onii-chan Touya to a fighting duel - to teach him a lesson , but ...

this whole story , with minor modifications , may function well enough for several similar settings ( dominant shota 'defeats' an objectively 'stronger' opponent in a 'duel' ) from many other anime or manga , so feel free to reuse it as a template as much as you like